5/5/14 6:19 PM EDT

Hillary Clinton attack dog David Brock has taken up yet another public campaign against the media, this time pressing CBS News to reopen its investigation into Lara Logan's discredited "60 Minutes" report on Benghazi.

In a letter to CBS News president David Rhodes and "60 Minutes" executive producer Jeff Fager, first obtained by The Huffington Post, Brock said reopening the investigation was "warranted" because a New York Magazine story had exposed that CBS' internal investigation "was not thorough, was wrong on critical points, and omitted key facts — facts that would have revealed that Logan's report was tainted by partisanship and unprofessional conduct."

Brock's chief complaint: CBS' internal review claimed Logan had reached out to the FBI and the State Department regarding her discredited source, Dylan Davies. As POLITICO reported in November, Logan did not reach out to the FBI. New York's Joe Hagan reported this week that she also did not reach out to the State Department. Brock also faults CBS for failing to note Logan's conversations with Sen. Lindsey Graham, a fierce critic of the Obama administration's handling of the attack.

Though best known as the founder of Media Matters, the liberal watchdog group, Brock is also the head of American Bridge PAC, which has devoted itself to Hillary Clinton's election in 2016. In the past year, Brock has served as Clinton's public advocate against the media, combating NBC, CNN, The New York Times and "60 Minutes" wherever and whenever there is even a whiff of anti-Clinton sentiment.